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Lettering is used for writing notes, dimensions, titles and details in title block. Good lettering improves appearance and usefulness of the sheet. Lettering should
be in plain and simple style. It should be clear, legible and uniform. In engineering, we generally use upright (not slant), single stroke (not bold) letters only.
Lettering should be done freehand to save time. Thus a student should know the correct method of lettering and should practice it. This is what this chapter
is designed for!
The Bureau of Indian Standards (BIS) has given certain guidelines for lettering in the Indian Standard SP: 46. Different lettering heights recommended are
2.5 mm, 5 mm, 7 mm, 10 mm, etc. Out of these, 2.5 mm is generally used for writing notes and dimensions, while 5 mm for subtitles and others for titles.
We will practice 2.5 mm, 5 mm and 7 mm sizes here.